/* ===================================================================
   ronri.org — An Organized Archive of Logical Thought
   Letterpress codex, scholarly press system, all-warm sepia palette.

   Typography per DESIGN.md:
     - Body / annotations: Crimson Pro (Google Fonts)
     - Chapter titles / running heads: Spectral (Google Fonts)
     - Logical notation: JetBrains Mono (Google Fonts)
   Animations triggered by Intersection Observer in script.js.
   =================================================================== */

/* ---------- Palette ------------------------------------------------- */
:root {
    --bg-parchment:   #F5EDE0;  /* Aged Parchment    */
    --bg-vellum:      #EDE3D2;  /* Vellum            */
    --ink-brown:      #3A2A1A;  /* Ink Brown         */
    --margin-gray:    #6B5E52;  /* Margin Gray       */
    --burgundy:       #5C2E2E;  /* Chapter Burgundy  */
    --ornament-gold:  #A68B5B;  /* Ornament Gold     */
    --notation-sepia: #7A5C3E;  /* Notation Sepia    */
    --rule-umber:     #C4B097;  /* Rule Umber        */

    --font-body:      "Crimson Pro", Georgia, "Times New Roman", serif;
    --font-display:   "Spectral", "Crimson Pro", Georgia, serif;
    --font-mono:      "JetBrains Mono", Menlo, Consolas, monospace;
}

/* ---------- Reset --------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    width: 100%;
}

html {
    font-size: 18px;
    background: var(--bg-parchment);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--ink-brown);
    background: var(--bg-parchment);
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Subtle paper texture using layered radial gradients on the body */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(166, 139, 91, 0.04) 0, transparent 60%),
        radial-gradient(circle at 80% 70%, rgba(122, 92, 62, 0.03) 0, transparent 55%),
        radial-gradient(circle at 50% 90%, rgba(58, 42, 26, 0.02) 0, transparent 70%);
}

/* ---------- Codex Container & Scroll-snap --------------------------- */
.codex {
    scroll-snap-type: y mandatory;
    height: 100vh;
    overflow-y: scroll;
    overflow-x: hidden;
    scroll-behavior: smooth;
    position: relative;
    z-index: 1;
}

/* Custom scrollbar to match the warm palette */
.codex::-webkit-scrollbar {
    width: 8px;
}
.codex::-webkit-scrollbar-track {
    background: var(--bg-vellum);
}
.codex::-webkit-scrollbar-thumb {
    background: var(--rule-umber);
    border-radius: 4px;
}
.codex::-webkit-scrollbar-thumb:hover {
    background: var(--ornament-gold);
}

/* ---------- Page (100vh sections) ----------------------------------- */
.page {
    scroll-snap-align: start;
    scroll-snap-stop: always;
    min-height: 100vh;
    height: 100vh;
    width: 100%;
    position: relative;
    padding: 6vh 8vw 6vh 8vw;
    background: var(--bg-parchment);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* Alternating Vellum tint for chapter pages II, IV, VI for spread feel */
.page-toc,
#page-iv,
#page-vi {
    background: linear-gradient(
        180deg,
        var(--bg-parchment) 0%,
        var(--bg-vellum) 100%
    );
}

/* ---------- Running Head -------------------------------------------- */
.running-head {
    position: sticky;
    top: 0;
    align-self: stretch;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding-bottom: 0.6rem;
    margin-bottom: 2.5rem;
    border-bottom: 0.5px solid var(--rule-umber);
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    font-variant: small-caps;
    color: var(--ink-brown);
    z-index: 5;
    background: transparent;
}

.running-head-left,
.running-head-right {
    opacity: 0.85;
}

/* ---------- Folio (page number) ------------------------------------- */
.folio {
    position: absolute;
    bottom: 3vh;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-display);
    font-size: 0.85rem;
    letter-spacing: 0.3em;
    color: var(--margin-gray);
    font-variant: small-caps;
}

.folio::before,
.folio::after {
    content: "·";
    margin: 0 0.7rem;
    color: var(--ornament-gold);
}

.folio-roman {
    font-style: italic;
    font-weight: 500;
}

/* ---------- Folio indicator (fixed top-right) ----------------------- */
.folio-indicator {
    position: fixed;
    top: 1.5rem;
    right: 1.8rem;
    z-index: 100;
    font-family: var(--font-display);
    font-size: 0.7rem;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    font-variant: small-caps;
    color: var(--margin-gray);
    background: rgba(245, 237, 224, 0.85);
    padding: 0.4rem 0.9rem;
    border: 0.5px solid var(--rule-umber);
    border-radius: 1px;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    transition: opacity 600ms ease;
}

.folio-indicator-label {
    margin-right: 0.5rem;
    opacity: 0.7;
}

.folio-indicator-number {
    color: var(--burgundy);
    font-style: italic;
    font-weight: 600;
    transition: color 800ms ease;
}

/* ---------- Rules (horizontal lines) -------------------------------- */
.rule {
    width: 100%;
    margin: 1.2rem 0;
    position: relative;
}

.rule-thin {
    height: 0.5px;
    background: var(--rule-umber);
}

.rule-medium {
    height: 1px;
    background: var(--ornament-gold);
}

.rule-double {
    height: 6px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.rule-double .rule-line {
    display: block;
    height: 1px;
    background: var(--ornament-gold);
}
.rule-double .rule-line:first-child {
    height: 2px;
}
.rule-double .rule-line:last-child {
    height: 0.5px;
}

/* Animated rule (draws left-to-right on view) */
.rule-animate {
    width: 0;
    transition: width 1500ms cubic-bezier(0.22, 1, 0.36, 1);
}
.rule-animate.is-visible {
    width: 100%;
}

/* ===================================================================
   Page I — Frontispiece
   =================================================================== */
.page-frontispiece {
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 8vh 10vw;
}

.frontispiece-frame {
    width: min(680px, 100%);
    border: 0.5px solid var(--rule-umber);
    padding: 6vh 4vw;
    background: rgba(237, 227, 210, 0.35);
    box-shadow:
        inset 0 0 0 1px rgba(196, 176, 151, 0.25),
        inset 0 0 60px rgba(166, 139, 91, 0.05);
    position: relative;
}

.frontispiece-inner {
    padding: 2.5rem 1rem;
}

.imprint-mark {
    font-family: var(--font-display);
    font-variant: small-caps;
    letter-spacing: 0.35em;
    text-transform: uppercase;
    font-size: 0.75rem;
    color: var(--margin-gray);
    margin-bottom: 2.5rem;
}

.title-kanji {
    font-family: var(--font-display);
    font-size: clamp(7rem, 14vw, 11rem);
    font-weight: 600;
    color: var(--burgundy);
    letter-spacing: 0.05em;
    line-height: 1;
    margin-bottom: 1rem;
    text-shadow: 0 1px 0 rgba(58, 42, 26, 0.05);
}

.title-roman {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 0.6em;
    text-transform: uppercase;
    color: var(--ink-brown);
    margin: 0 0 2.5rem 0.6em; /* trailing letter-spacing compensation */
}

.subtitle {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
    font-size: clamp(1.05rem, 1.6vw, 1.35rem);
    color: var(--ink-brown);
    margin: 1.4rem 0;
    letter-spacing: 0.02em;
}

.press-line {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.85rem;
    color: var(--margin-gray);
    margin-top: 2rem;
    letter-spacing: 0.05em;
}

.fleuron {
    font-family: var(--font-display);
    color: var(--ornament-gold);
    font-size: 2.4rem;
    line-height: 1;
}

.fleuron-bottom {
    margin-top: 3vh;
}

.ornament-gold {
    color: var(--ornament-gold);
    margin: 0 0.4em;
}

/* ===================================================================
   Page II — Table of Contents
   =================================================================== */
.page-toc {
    align-items: center;
    justify-content: flex-start;
}

.toc-body {
    width: min(780px, 100%);
    margin: 4vh auto 0;
    text-align: center;
}

.section-eyebrow,
.chapter-eyebrow,
.colophon-eyebrow {
    font-family: var(--font-display);
    font-variant: small-caps;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    font-size: 0.7rem;
    color: var(--ornament-gold);
    margin-bottom: 1rem;
}

.page-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2.2rem, 4vw, 3.2rem);
    color: var(--burgundy);
    letter-spacing: 0.01em;
    margin-bottom: 0.8rem;
}

.toc-list {
    list-style: none;
    margin-top: 3rem;
    text-align: left;
}

.toc-entry {
    margin: 0.4rem 0;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 700ms ease, transform 700ms ease;
}

.toc-entry.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.toc-link {
    display: grid;
    grid-template-columns: 2.5rem 1fr auto 3rem;
    align-items: baseline;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--ink-brown);
    padding: 0.65rem 0.4rem;
    font-family: var(--font-body);
    font-size: 1.15rem;
    transition: color 350ms ease, background-color 350ms ease;
    position: relative;
}

.toc-link:hover {
    color: var(--burgundy);
    background-color: rgba(166, 139, 91, 0.08);
}

.toc-roman {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 500;
    color: var(--margin-gray);
    text-align: right;
}

.toc-title {
    font-family: var(--font-display);
    font-weight: 500;
    letter-spacing: 0.01em;
}

.toc-leaders {
    position: relative;
    height: 1px;
    align-self: end;
    margin-bottom: 0.45rem;
    overflow: hidden;
    width: 100%;
    min-width: 80px;
}

/* Leader dots — generated by JS as inline-block dots; fall back to
   border-bottom dotted if JS doesn't run.                            */
.toc-leaders::before {
    content: "";
    position: absolute;
    inset: 0;
    border-bottom: 1px dotted var(--rule-umber);
    opacity: 0;
    transition: opacity 400ms ease;
}

.toc-leaders.is-fallback::before {
    opacity: 1;
}

.toc-leaders .leader-dot {
    display: inline-block;
    width: 3px;
    height: 3px;
    margin-right: 5px;
    background: var(--rule-umber);
    border-radius: 50%;
    opacity: 0;
    transform: scale(0.4);
    transition: opacity 200ms ease, transform 200ms ease;
}

.toc-leaders .leader-dot.is-visible {
    opacity: 0.95;
    transform: scale(1);
}

.toc-folio {
    font-family: var(--font-display);
    font-variant: small-caps;
    letter-spacing: 0.15em;
    color: var(--margin-gray);
    font-size: 0.85rem;
    text-align: right;
    font-style: italic;
}

.toc-entry-coda .toc-link {
    margin-top: 1.5rem;
    padding-top: 1.2rem;
    border-top: 0.5px solid var(--rule-umber);
}

.fleuron-row {
    margin-top: 3rem;
    text-align: center;
    color: var(--ornament-gold);
    font-family: var(--font-display);
    font-size: 1.5rem;
    letter-spacing: 1.2em;
    padding-left: 1.2em;
}

.fleuron-row .ornament {
    display: inline-block;
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 600ms ease, transform 600ms ease;
}

.fleuron-row.is-visible .ornament {
    opacity: 1;
    transform: scale(1);
}
.fleuron-row .ornament:nth-child(2) { transition-delay: 200ms; }
.fleuron-row .ornament:nth-child(3) { transition-delay: 400ms; }

/* ===================================================================
   Pages III–VI — Chapters with two-column scholarly grid
   =================================================================== */
.page-chapter {
    padding: 5vh 8vw;
}

.chapter-grid {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 30px 0.4fr;
    gap: 0;
    align-items: start;
    max-height: calc(100vh - 18vh);
    overflow: hidden;
    position: relative;
}

.chapter-main {
    grid-column: 1;
    padding-right: 1rem;
    overflow: hidden;
}

.chapter-margin {
    grid-column: 3;
    position: relative;
    padding-left: 1.2rem;
    padding-top: 4rem;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 800ms ease 400ms, transform 800ms ease 400ms;
}

.chapter-margin.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* The vertical rule lives in the gap (grid-column 2) via ::before */
.margin-rule {
    position: absolute;
    top: 0;
    bottom: 0;
    left: -16px;
    width: 1px;
    background: var(--rule-umber);
    opacity: 0.7;
}

.chapter-eyebrow {
    margin-bottom: 0.6rem;
}

.chapter-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2rem, 3.5vw, 3rem);
    color: var(--burgundy);
    letter-spacing: 0.005em;
    line-height: 1.1;
    margin-bottom: 0.3rem;
}

.chapter-lede {
    font-family: var(--font-body);
    font-size: 1.25rem;
    line-height: 1.55;
    margin: 1.2rem 0 1.5rem;
    color: var(--ink-brown);
    font-weight: 500;
    letter-spacing: 0.005em;
}

.chapter-main p {
    font-family: var(--font-body);
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 1.1rem;
    color: var(--ink-brown);
    text-align: justify;
    hyphens: auto;
}

.chapter-main p em,
.chapter-margin em {
    font-style: italic;
    color: var(--ink-brown);
}

/* Notation — JetBrains Mono inline */
.notation {
    font-family: var(--font-mono);
    font-size: 0.95em;
    color: var(--notation-sepia);
    letter-spacing: 0;
    background: rgba(196, 176, 151, 0.12);
    padding: 0.05em 0.3em;
    border-radius: 1px;
}

/* Footnote references (superscripts) */
.footref {
    font-family: var(--font-mono);
    font-size: 0.7em;
    color: var(--burgundy);
    margin-left: 0.05em;
    cursor: pointer;
    transition: color 250ms ease;
    vertical-align: super;
}
.footref:hover {
    color: var(--ornament-gold);
}

/* Block-level proof display */
.proof-block {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.85;
    color: var(--notation-sepia);
    background: rgba(237, 227, 210, 0.55);
    border-left: 2px solid var(--ornament-gold);
    padding: 1rem 1.4rem;
    margin: 1.2rem 0 1.4rem;
    overflow-x: auto;
    white-space: pre;
}

.proof-line {
    display: block;
}

/* Margin annotations */
.annotations {
    list-style: none;
    counter-reset: anno;
}

.annotation {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.92rem;
    line-height: 1.55;
    color: var(--margin-gray);
    margin-bottom: 1.2rem;
    display: grid;
    grid-template-columns: 1.4rem 1fr;
    gap: 0.4rem;
    transition: color 300ms ease;
}

.annotation.is-active {
    color: var(--ink-brown);
}

.annotation-num {
    font-family: var(--font-mono);
    font-style: normal;
    font-size: 0.78rem;
    color: var(--burgundy);
    text-align: right;
    padding-top: 0.05rem;
}

.annotation-glossary .annotation-num {
    color: var(--ornament-gold);
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.1rem;
}

.annotation em {
    color: var(--burgundy);
    font-style: italic;
}

/* ===================================================================
   Page VII — Colophon
   =================================================================== */
.page-colophon {
    align-items: center;
    justify-content: center;
    padding: 6vh 10vw;
    text-align: center;
}

.colophon-frame {
    width: min(720px, 100%);
    margin: 0 auto;
}

.colophon-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2rem, 3.5vw, 2.8rem);
    color: var(--burgundy);
    margin-bottom: 0.8rem;
}

.colophon-body {
    text-align: left;
    margin-top: 2.5rem;
}

.colophon-lede {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--ink-brown);
    margin-bottom: 2rem;
    text-align: center;
}

.colophon-list {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 0.7rem 1.6rem;
    margin: 2rem 0;
    font-family: var(--font-body);
    font-size: 0.98rem;
    line-height: 1.55;
}

.colophon-list dt {
    font-family: var(--font-display);
    font-variant: small-caps;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    font-size: 0.72rem;
    color: var(--burgundy);
    text-align: right;
    padding-top: 0.25rem;
}

.colophon-list dd {
    color: var(--ink-brown);
    font-style: italic;
}

.press-line-final {
    text-align: center;
    margin-top: 2rem;
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.9rem;
    color: var(--margin-gray);
    letter-spacing: 0.1em;
}

/* ===================================================================
   Kanji Watermark
   =================================================================== */
.kanji-watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 600px;
    line-height: 1;
    color: var(--ink-brown);
    opacity: 0.03;
    pointer-events: none;
    user-select: none;
    z-index: 0;
}

.kanji-watermark-large {
    font-size: 720px;
    opacity: 0.04;
}

/* Make sure interactive content sits above watermark */
.frontispiece-frame,
.toc-body,
.chapter-grid,
.colophon-frame,
.running-head,
.folio {
    position: relative;
    z-index: 2;
}

/* ===================================================================
   Animations
   =================================================================== */

/* Fade-reveal for incoming page elements */
.page-frontispiece .frontispiece-inner > *,
.page-frontispiece .fleuron-bottom {
    opacity: 0;
    transform: translateY(8px);
    animation: fadeInUp 1200ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
}
.page-frontispiece .imprint-mark    { animation-delay: 200ms; }
.page-frontispiece .title-kanji     { animation-delay: 350ms; }
.page-frontispiece .title-roman     { animation-delay: 700ms; }
.page-frontispiece .rule:nth-of-type(1) { animation-delay: 900ms; }
.page-frontispiece .subtitle        { animation-delay: 1050ms; }
.page-frontispiece .rule:nth-of-type(2) { animation-delay: 1200ms; }
.page-frontispiece .press-line      { animation-delay: 1400ms; }
.page-frontispiece .fleuron-bottom  { animation-delay: 1700ms; }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes drawIn {
    from { width: 0; }
    to   { width: 100%; }
}

@keyframes scalePulse {
    0%, 100% { transform: scale(1); }
    50%      { transform: scale(1.04); }
}

/* Hover scale on fleurons */
.ornament,
.fleuron {
    transition: transform 600ms cubic-bezier(0.22, 1, 0.36, 1),
                color 300ms ease;
    display: inline-block;
}

.ornament:hover,
.fleuron:hover {
    transform: scale(1.12);
    color: var(--burgundy);
}

/* ===================================================================
   Mobile Adaptation
   =================================================================== */
@media (max-width: 768px) {
    html {
        font-size: 16px;
    }

    .page {
        padding: 5vh 6vw;
    }

    .running-head {
        font-size: 0.62rem;
        margin-bottom: 1.6rem;
    }

    .folio-indicator {
        top: 1rem;
        right: 1rem;
        font-size: 0.6rem;
        padding: 0.3rem 0.7rem;
    }

    /* Frontispiece scales down */
    .title-kanji {
        font-size: clamp(5rem, 22vw, 7rem);
    }
    .title-roman {
        font-size: 0.95rem;
        letter-spacing: 0.45em;
        margin-left: 0.45em;
    }
    .frontispiece-inner {
        padding: 1.5rem 0.5rem;
    }

    /* TOC */
    .toc-link {
        grid-template-columns: 2rem 1fr 2.4rem;
        font-size: 1rem;
    }
    .toc-leaders {
        display: none;
    }

    /* Chapters collapse to single column; annotations become inline footnotes */
    .chapter-grid {
        grid-template-columns: 1fr;
        max-height: none;
        overflow: visible;
    }

    .chapter-main {
        grid-column: 1;
        padding-right: 0;
    }

    .chapter-margin {
        grid-column: 1;
        padding-left: 0;
        padding-top: 1rem;
        margin-top: 1.5rem;
        border-top: 0.5px solid var(--rule-umber);
        opacity: 1;
        transform: none;
    }

    .margin-rule { display: none; }

    .annotations {
        font-size: 0.88rem;
    }

    .annotation {
        cursor: pointer;
    }

    /* Collapse annotation bodies on mobile (tap to expand) */
    .annotation .annotation-body {
        max-height: 1.4em;
        overflow: hidden;
        display: block;
        position: relative;
        transition: max-height 400ms ease;
    }

    .annotation.is-open .annotation-body {
        max-height: 30em;
    }

    .chapter-main p {
        font-size: 1rem;
    }

    .chapter-lede {
        font-size: 1.1rem;
    }

    .chapter-title {
        font-size: 2rem;
    }

    .proof-block {
        font-size: 0.85rem;
        padding: 0.8rem 1rem;
    }

    .colophon-list {
        grid-template-columns: 1fr;
        gap: 0.2rem 0;
    }

    .colophon-list dt {
        text-align: left;
        margin-top: 1rem;
    }

    .kanji-watermark {
        font-size: 320px;
    }

    .kanji-watermark-large {
        font-size: 360px;
    }
}

/* On very tall narrow screens reduce vertical padding */
@media (max-width: 480px) {
    .page {
        padding: 4vh 5vw;
    }
}